Dhcp Relay Implementation; Global Dhcp; Setting The Ip Address - Alcatel OmniSwitch 6624 Network Configuration Manual

DHCP Relay Implementation

DHCP Relay Implementation
The OmniSwitch allows you to configure the DHCP Relay feature in one of two ways. You can set up a
global DHCP request or you can set up the DHCP Relay based on the VLAN of the DHCP request. Both
of these choices provide the same configuration options and capabilities. However, they are mutually
exclusive. The following matrix summarizes the options.
Per-VLAN DHCP Relay Global DHCP Relay
Disabled
Disabled
Enabled
Enabled

Global DHCP

For the global DHCP service, you must identify an IP address for the DHCP server.

Setting the IP Address

The DHCP Relay is automatically enabled on a switch whenever a DHCP server IP address is defined by
using the ip helper address
service. You should configure DHCP Relay on switches where packets are routed between IP networks.
The following command defines a DHCP server address:
-> ip helper address 125.255.17.11
The DHCP Relay forwards BOOTP/DHCP broadcasts to and from the specified address. If multiple
DHCP servers are used, one IP address must be configured for each server. You can configure up to 256
addresses for each relay service.
To delete an IP address, use the no form of the
this syntax will be deleted. If an IP address is not specified with this syntax, then all IP helper addresses
are deleted. The following command deletes an IP helper address:
-> ip helper no address 125.255.17.11
page 15-8
Disabled
Enabled
Disabled
Enabled
command. There is no separate command for enabling or disabling the relay
ip helper address
OmniSwitch 6624/6648 Network Configuration Guide
Effect
DHCP Request is flooded within its VLAN
DHCP Request is relayed to the Global Relay
DHCP Request is relayed to the Per-VLAN Relay
N/A
command. The IP address specified with
Configuring DHCP Relay
April 2004